Purifier sieve and mounting means therefor



Nov. 15, 1949 J. P. WOOLCOTT ET AL.

PURIFIER SIEVE AND MOUNTING MEANS THEREFOR Filed July 16, 1947 2 Sheets-She et 1 J P WooLcoT' A HARRY M. h/ooLcaT'C v @TORNEYI J. P. WOOLCOTT ET AL. 2,487,914

PURIFIER SIEVE AND MOUNTING MEANS THEREFOR 2 Sheets-Sheet 2 Nov. 15, 1949 Filed July 16, 1947 29 I INVENTOR,

, JOHN F WOOLCQTT AND HARRY \A ooLcoTt JR, EYMQMI fiTToRNE):

Patented Nov. 1 5, 1949 OFFICE PURIFIER SIEVE AND MOUNTING MEANS THEREFOR.

. John P. Woolcott and Harry M. Woolcott, Jr.,

' Harrisburg, Ill

Application July 16, 1947, Serial No. 761,204

This invention relatesto the construction of a,

sieve purifier as is employed in fiourinills.

In these purifiers, the practice has heretofore been to supply a frame supported by hangers attached to cams or eccentrics which give the necessary shaking or travel motion to the frame. Then the sieve proper consisted of one of several different mesh sizes of cloths which was attached to 'the top of two spaced apart wood strips inserted inthe frame and pulled one from the other by thumb screws to make the cloth taut. Sometimes to prevent'undue sagging, a center strip would be supplied to which the cloth would be attached and a piece brought up thereagainst to hold it.

However such a construction presented several disadvantages due primarily to the fact that much difficulty was encountered in stretching the cloth firmly on the frame and so adjusting it to prevent sagging; and also to the difficulty of patching or mending holes or tears in the cloth itself. In order to make such repairs, the machine would -have to be shut down entirely thereby interrupting the flow through that machine during the great amount of time consumed in repairing or replacing the cloth.

My invention resides in a construction which eliminates those difficulties by reason of the ability to use the bolting or sieve cloths in relatively small areas so that sagging is practically eliminated, and further, one of these small cloths may be removed and replaced without the necessity of having to shut down the purifier itself. Further, changes in flow may be had while the purifier is in motion by changing the cloth to substitute finer or coarser mesh cloth as the different flowing might require. v

These and many other objects and advantages of the invention will become .clear to those versed in the art in 'the'following description of one particular form of the invention as illustrated in the accompanying drawings, in which Fig. 1 is a top plan view of the purifier frame to which the invention is applied;

Fig. 2, a view in vertical longitudinal section on the line 2-2 in Fig. 1 on an enlarged scale; Fig. 3, a view in end elevation of the frame;

Fig. 4, a detail in side elevation on the latch side of the frame;

Fig. 5, a detail in vertical section on the line 55 in Fig. 4;

Fig. 6, a detail in vertical section on the line 6-6 in Fig. 1;

1 Claim. (Cl. 209?403) 2' 7 charge end portion of the purifier frame less sieve frames; and

Fig. 9, a view in top perspective of a sieve frame.

Referring to the drawings, in which like-characters of reference indicate like parts throughout the several views, a sieve frame generally designated by the numeral I0 is provided with the side rails H and I2 along the inner sidesof which, spaced upwardly from their lower edges-are attached respectively the bars l3 and I4, these bars being parallel to those lower edges. The receiving end of the frame It is provided with a cross rail l5. Against the cross rail I5 is secured an angle bar I6 to have one leg ll, horizontally disposed and its otherleg l8, turned downwardly and in contact with 'the inner face of the cross rail l5. 1

A like angle bar I?! interconnects the discharge end portions of the side rails H and [2 to have one leg 28 horizontally and inwardly turned and with the other leg 2| downwardly turned substantially within the plane of the vertically disposed ends of side rails H and i2. Both of these angle bars l6 and H! by their respective ends extend under the opposite bars I3 and 14 so as to have the upper faces of their horizontal legs I! and 2!] in the plane of the under sides of those bars l3 and M. Along the under edge portion of one of the side rails H and [2, herein shown as the rail 1 l, is fixed a plate 22 to extend entirely therealong preferably and to project inwardly from the inside face of that rail I I.

Then at regular spaced intervals between the angle bars. [6 and I9 there are fixed to extend across the space between the side rails I l and I2 a plurality of T irons 23, herein shown, Fig. 1, for example, as six in number. Each of these irons 23 has its central leg 24 turned downwardly and its upper face positioned in the plane of the under sides of the bars !3 and I4 by securing .the respective ends of: the irons 23 againstand to the under sides of those longitudinally disposed bars l3 and, by any suitable means such as by screws 25 as indicated in Fig. 6. A plurality of sieveframes generally designated by the numeral 25, seven being required for the present example, are made to be units to be removably carried by the frame lfl. Referring to Fig. 9, primarily, each sieve frame is essentially a rectangle made by uniting side rails '21 and 28 with the end rails '29 and 30. Then across the opening between these four rails there is secured the bolting cloth 3| by any suitable means such as by tacking through its margin to the top sides of the respective rails. The dimensions of these sieve frames 26 are made to be such that they may be fitted between the side rails I I and I2 of the purifler frame, one frame 26 between each of the two adjacent T irons and between the end angle irons l6 and I9 and the next adjacent T irons 23. In other words, the T irons are so spaced apart from the angle irons, and from each other, that a sieve frame 26 maybe carried within any of those spacings.

To place a sieve 26 as assembled with the bolting cloth thereon, the sieve frame is brought up to the frame to have the rail 2.9,placed on top of the strap 22 and then the frame 26 is rocked upwardly to bring the top sides of all of its rails respectively against the bars t3 and i4 and the under sides of the horizontally disposed legs of the T irons or of an angle iron and .a T iron as the case may be. In this respect, each of the side rails 2! and 28 of the sieve frame '26 is rabbetted along its upper outer corner in order to the :bolting cloth .3! to be brought substantially into the plane across the top sides of the J and end angle irons. Each of the sieve 26 is maintained that position wherein the cloth 311 is in the plane of the top sides of the intervening irons :by means of any suitable latches .32. Fig. 5. In the present showing, the cross :rail 36 of each sieve frame 26 carries two of :these latches :32 secured thereto on its under side .to have the latch tongue 33 springur ed outwardly to engage within a keeper 24 located :in its :path on the under side of the rail '12. These tongues '33 are properly bevelled so that they will retract by pressure against the keeper 34,, and then snap into the keeper and retain the sieve frame in the desired position indicated; following rocking of the sieve frame into that position.

indicated in Fig. 1, the entire purifier frame :is filied with the individual sieve frames 26. It is to be seen that by this construction, the bolting cloth 6.1 may be much easier pulled up tautly across the relatively short frames 26 than in the former practice where the clothhad to be carried over the entire area between the rails H and 12 with the resultant, inevitable sagging. Now should any one of the individual bolting cloths 3i become torn or unduly worn, the particular frame 2:; carrying that cloth may be immediate- Tly dropped out of the frame In and another frame '26 substituted quickly without any appreciable loss of flow. The latches 32 are preferably made without any external operating members and bolts, and the tongues '33 may be retracted from keepers 34 by pushing them back with some implement like a screwdriver in order to release the frame.

It is understood here that the frame It) will be supported in the purifier in the usual manner by a structure not herein illustrated since it does not enter into the invention per se. The stock not going through the bolting cloth 3i will in the usual manner discharge over the angle iron 19. Further it is to be noted that by rabbetting the upper corner of the side rails 21 and 28 of each frame 26 these rails may respectively abut rails of the next adjacent frame to prevent any appreciable travel of the sieve frames 26 longitudinally of the frame l0, so that such travel is not necessarily dependent upon the fit of those rails with the cross irons. The height of the rails 2! and 28 is made to be such as above indicated, that the topside of the bolting {Cl th 31 comes substantially within the plane of the top sides of the irons [6, I9, and 23 whereby the smooth, uninterrupted flow of the stock from the cross rail .end of the frame It) to the angle iron l9 endis provided.

While the invention has been described in the one particular form, it is obvious that structural changes may be employed particularly in the manner of securing individual elements one to the other, and their specific shapes, without departing from the spirit of the invention and we therefore do not desire tobe limited to that precise form any more than may be required by the following claim.

We claim;

Ina purifier sieve, the combination of a shaker frame comprising a Pair of spaced apart side rails, a bar along the inner side of each of said rails spaced above and parallel to the lower edge portions thereof, a plurality of longitudinally and equally spaced apart T irons secured by their opposite ends to have their heads disposed in a common plane against the 'undersides of said bars, and a member along said lower edge portion of one of said rails extending inwardly from that rail and spaced below said bars on that rail;

and a plurality of interchangeable, cloth covered sieve frames, eachiindividual-1y removable from the u-nders-ides of saidheads, to have one side entered between said bar and said member on the said one rail and to have its opposite side swung up ward-1y adjacent the inner side of said other rail and stopped against the underside of said bar thereon; spring latches supporting said opposite sieve frame sides from said other rail and holding them. against the bar thereon; all of said sieve frames abutting one another by adjacent transverse ends under said irons, each of said adjacent sieve frame ends being relieved'to receive said T irons therebetween, and present a common planar surface, including the top faces of said heads and said cloth coverings.

JOHN P. WOOLCOTT. HARRY WOOLCO-IT, JR.

REFERENCES CITED The following references are of record in the file of this patent:

STATES PATENTS 

